Frederic Weisbecker <frederic@kernel.org> writes:> On Sun, Mar 08, 2020 at 11:24:00PM +0100, Thomas Gleixner wrote:>> context tracking lacks a few protection mechanisms against instrumentation:>> >> - While the core functions are marked NOKPROBE they lack protection>> against function tracing which is required as the function entry/exit>> points can be utilized by BPF.>> Just to clarify things up: IIUC, BPF scripts can be called from the> function graph tracer hooks, and that BPF code uses RCU, right?